Practical refreshers

Practice, revisit and keep the gaps in view.

Short reading exercises with original feedback and an optional browser review queue.

All ten lessons · Learning library

Six short exercises revisit named label amounts, whole-package costs and missing COA information. They reuse the existing lesson questions and explanations. Revise any answer; shopping and research remain open to everyone.

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Fictional reading exercise

Name the amount before using it

The fictional label gives 1,200 mg formula and 900 mg CBD. Which is its CBD-only denominator?

Read the supported answer and reasoning

900 mg CBD Correct: the fictional label explicitly names 900 mg CBD.

Reopen the original lesson and revise your reading

Original lesson sources & scope
  • FDA: CBD and cannabis product distinctions

    Checked 2026-10-26 · Opening bullet: CBD is a single compound, marijuana is plant material with multiple compounds. Compound/mixture distinction only; US agency source is not worldwide eligibility advice.

  • NIST IR 8519: cannabinoid measurement report

    Checked 2026-10-26 · Abstract; Table 2-7 footnote; Section 3.4.2.1. Scoped abstract, Table 2-7 ND note and reporting-limit passage; not all 304 pages reviewed.

The answer concerns the stated fictional example. These links retain the original lesson’s source dates and review limits.

Fictional reading exercise

Name the amount before using it

A second fictional package states only 1,200 mg formula. What CBD-only value should a comparison use?

Read the supported answer and reasoning

Unknown until a CBD-only amount is supported Correct: retain the missing denominator.

Reopen the original lesson and revise your reading

Original lesson sources & scope
  • FDA: CBD and cannabis product distinctions

    Checked 2026-10-26 · Opening bullet: CBD is a single compound, marijuana is plant material with multiple compounds. Compound/mixture distinction only; US agency source is not worldwide eligibility advice.

  • NIST IR 8519: cannabinoid measurement report

    Checked 2026-10-26 · Abstract; Table 2-7 footnote; Section 3.4.2.1. Scoped abstract, Table 2-7 ND note and reporting-limit passage; not all 304 pages reviewed.

The answer concerns the stated fictional example. These links retain the original lesson’s source dates and review limits.

Fictional reading exercise

Compare the whole package

A fictional label states 3,000 mg extract but no CBD-only amount. What is its CBD unit price?

Read the supported answer and reasoning

Unknown until the CBD-only total is supported Correct: the CBD-only denominator is unresolved.

Reopen the original lesson and revise your reading

Original lesson sources & scope
  • CannaCompare: source and document scope

    Checked 2026-10-26 · Label arithmetic; laboratory checks; source and scope sections. Site-defined comparison/report conventions, not an independent scientific endorsement.

The answer concerns the stated fictional example. These links retain the original lesson’s source dates and review limits.

Fictional reading exercise

Compare the whole package

A fictional USD 60 bottle explicitly contains 3,000 mg CBD. What is its item-price ratio?

Read the supported answer and reasoning

USD 0.02/mg CBD Correct:60 divided by 3,000 equals 0.02.

Reopen the original lesson and revise your reading

Original lesson sources & scope
  • CannaCompare: source and document scope

    Checked 2026-10-26 · Label arithmetic; laboratory checks; source and scope sections. Site-defined comparison/report conventions, not an independent scientific endorsement.

The answer concerns the stated fictional example. These links retain the original lesson’s source dates and review limits.

Fictional reading exercise

Read a COA from the outside in

A fictional report matches its issuer’s record, but the shipping lot is unknown. What follows?

Read the supported answer and reasoning

Only the checked document scope is established; current inventory remains unknown Correct: keep the confirmation within the stated scope.

Reopen the original lesson and revise your reading

Original lesson sources & scope
  • CannaCompare: source and document scope

    Checked 2026-10-26 · Label arithmetic; laboratory checks; source and scope sections. Site-defined comparison/report conventions, not an independent scientific endorsement.

The answer concerns the stated fictional example. These links retain the original lesson’s source dates and review limits.

Fictional reading exercise

A missing panel is still missing

A fictional COA has cannabinoids but no metals section. How should metals coverage be shown?

Read the supported answer and reasoning

Not established from that report Correct: keep the missing coverage visible.

Reopen the original lesson and revise your reading

Original lesson sources & scope

The answer concerns the stated fictional example. These links retain the original lesson’s source dates and review limits.